A2A Protocol Specification Structure
The specification is organized into three distinct layers that work together to provide a complete protocol definition: Layer 1: Canonical Data Model defines the core data structures and message formats that all A2A implementations must understand. These are protocol agnostic definitions expressed as Protocol Buffer messages. Layer 2: Abstract Operations describes the fundamental capabilities and behaviors that A2A agents must support, independent of how they are exposed over specific protocols. Layer 3: Protocol Bindings provides concrete mappings of the abstract operations and data…